Heat Wave and Severe Thunderstorms this Independence Day

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Midwest, and Mid-Atlantic. Numerous temperature records are expected. Clusters of severe thunderstorms will move across parts of the Allegheny Plateau into Mid Atlantic this Independence Day, with potential for widespread damaging winds. Additional severe thunderstorms in the Great Plains. Read More >

Hazardous Weather Conditions

Air Quality Alert

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Mostly Cloudy

75°F

24°C

Humidity	90%
Wind Speed	S 5 mph
Barometer	30.02 in (1017.4 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Last update	4 Jul 9:56 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

North Potomac MD

Tonight
Low: 73 °F
Severe
Thunderstorms
then Chance
Showers and
Patchy Fog
Sunday
High: 94 °F
Mostly Sunny
then Showers
Likely
Sunday Night
Low: 70 °F
Heavy Rain
then Chance
Showers
Monday
High: 84 °F
Showers
Likely then
Showers
Monday Night
Low: 67 °F
Showers
Tuesday
High: 82 °F
Slight Chance
Showers then
Showers
Likely
Tuesday Night
Low: 66 °F
Showers
Likely then
Slight Chance
T-storms
Wednesday
High: 84 °F
Mostly Sunny
Wednesday Night
Low: 67 °F
Partly Cloudy

Detailed Forecast

Tonight

Scattered showers and thunderstorms. Some of the storms could be severe. Patchy fog between midnight and 1am. Otherwise, mostly cloudy, with a low around 73. Calm wind. Chance of precipitation is 50%.

Sunday

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Mostly sunny, with a high near 94. Heat index values as high as 103. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night

Showers and thunderstorms before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Low around 70. Northeast wind around 6 mph becoming calm after midnight. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Monday

Showers and possibly a thunderstorm. High near 84. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday Night

Showers and possibly a thunderstorm. Low around 67. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

Tuesday

A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 82. Chance of precipitation is 60%.

Tuesday Night

Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

Wednesday

Mostly sunny, with a high near 84.

Wednesday Night

Partly cloudy, with a low around 67.

Thursday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 30%.

Thursday Night

A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 30%.

Friday

A chance of showers and thunderstorms. Partly sunny, with a high near 92. Chance of precipitation is 50%.

Friday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.